'Oh Anne, you're right Someone was looking in at the window! And if we saw him, he must have seen us!'

Anne and George are camping out and eagerly awaiting the boys' arrival. But one night, Anne sees a mysterious face at the window of the ruined cottage close by - and the others see ghostly light.
Anne wants to go home but the others are determined to stay. Who is snooping around the cottage - and why is a nearby gang trying to make the Five leave?